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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631966c03fc347bc92fe289be6b4113ce77d92172fec93931e151bcf53fca7d5' 
  AND token = 'rgqwbV5MKNl5lb2ZTDimp5pGjquar7CLVucoO6p4B7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}